All 4 are High-voltage li-ion type batteries, when used in single cell light items, you need to be sure that the light is manufactured to handle them, the light will usually SAY it is designed for them, or say it will handle both primaries and secondary cells. Substituting a 3.6v cell for a 1.2v cell without the light being able to handle it, wouldnt be good applications
Max charge ~4.2 max discharge ~ 2.5 prefer to not go that low.
10440, AAAsized li-ion ~300ma , good for keylights due to small size, would work for lights that stay under 1 watt drive, although (as usual) can be rode hard and put away hot
they WILL NOT work in most cheap 3XAAA lights unless you reconfigure for parellel instead of series. that is ~12volts going into a light expecting ~4.5, again be sure any light using them can handle the higher voltage, or you will likly fry some tiny driver that is hard to replace. most are completly unprotected, even mechanically, and therin require great care to maintain.
14500 AA sized li-ion ~700ma , many single AA lights are designed to handle the voltage, many double most tripple and quadrouple AA lights will not, and will burn out. good for pocket lights, and configuring high voltages in small packages. This size of cell can come protected. it is capable of driving up to 3W of led power at least intermittantally.
neither of the smaller sizes of li-ion are very "robust" cells, the capacity is often very overrated, many are used in place of thier AA and AAA counterparts, when the voltage is STILL to high it is NOT an actual AA or AAA and therfore it is bad for me to relate them as that size even. if you want Same voltage as Consumer items, use Ni-Mh rechargables as they ARE similar voltages to thier alkaline counterparts.
18650 Laptops and video battery packs have used these for ages, ranging in capacity between ~1500-2800 much development has gone into them throughout the ages, so they are often very robust and can be very long lasting (to bad you arent in japan buying them
small pocket lights are manufactured (now) to make use of this cell specifically, and many other lights that USE 2x123 primary will use a single 18650 quite nicely TOO if they provided the space for the cell size. most single and double lights that SAY they will use them, use them properly.
this cell can also be purchaced as a protected cell.
You can find this cell used in both larger long throwing lights, and lights that are barely bigger than the cell itself. so the Range of the type of item it can be used in varys so widely as to replace a Mag, or to be a pocket light.
common actual capacity is about 2400-2600 when driving a high powered LED light on full. it is capable of driving up to 3x3W leds , although that is pushing it a bit
RCR 123 - cute little battery for everything from stubbie keylights, to anything else they can jam up to 8 or 9 of these things into . high potency in both the primary and the rechargable. ~500-700ma max capacity in the rechargable (way less than the primary), come in many different flavors styles and types:
Lithium primary, a regulated down to ~3v li-ion tries to simulate a primary voltage, a Protected 3.6v li-ion and , li-FE-po ~3.2v safer chemistry lower voltage, unprotected also avilable.
again some are higher voltage than thier Primary(throwaway) counterparts, and because of that any light using them in any way would need to be able to handle the voltage differenaces.
the regulated and li-Fe-Po are both so similar in voltage to the primary 123 they have no problems replacing a 123 without worry.
Most 2x123 lights will easily handle 2XRechargable verisons of it, many single lights overdrive. more commonly lights that state they will use them WILL, without going into overdrive.
123s being originally photo and high discharge batteries will drive ~3w of leds.
you want to get protected verision of any of this stuff, or you have to manually protect it by work
A good quality cell item will last much longer than a cheap one over TIME (as in years)
you want to make sure that the charger you get will handle the actual chemistry type, as the newer safer lower capacity Li-Fe-po has different charge discharge parameters. and regulated down 123 cells use a different charge voltage.
hmmm, donno what else to say because your question is so WIDE, that i should instead Point you to a FAQs instead of making a bigger mess by trying to answer it in one jumbled pile.
if all you see to buy is trustfire and ultrafire, trustfire has been recieving better specs to date (the black band one if i remember right), but if you ask me they are both junk
other brand names arent going to do you a lot of good if all you end up with are Clones
